I’m thinking it’s not so much hypothetical as wishful thinking. I remember during Francis’ election there was a somewhat controversial cardinal who had often declared that Benedict’s rules didn’t go far enough. He didn’t get to go to the Vatican because of a family issue that involved a relative being near death.
Quite a few speculated that he could be declared Pope and that Rome, perhaps, would take the “show” on the road and he’d be ordained Pope right where he was so dying relative could see him become the Pope.
That said, we ought to look at history books. People are not as free to travel in years past as they are today. It would be reasonable that there’s been at least one pope that the conclave has elected that wasn’t sitting right there. Like I said before, I imagine that as the list was narrowed down, this man would be called for so he could be present should the Holy Spirit choose him.